R&S ESR Series

Tracking Generator
R&S
®
ESR
490User Manual 1175.7068.02 ─ 12
●
If the stop frequency lies above F MAX, the generator is switched off. When the
generator is subsequently switched on using the "Source RF Internal (On/ Off)"
on page 477 softkey, the stop frequency is limited to F MAX.
●
If the stop frequency lies below F MIN, the generator is switched off and an error
message is displayed.
Remote command:
SOURce<n>:EXTernal<generator>:FREQuency[:FACTor]:NUMerator
on page 909
SOURce<n>:EXTernal<generator>:FREQuency[:FACTor]:DENominator
on page 909
SOURce<n>:EXTernal<generator>:FREQuency:OFFSet<m> on page 910
Reverse sweep
The "Offset" setting can be used to sweep in the reverse direction. You can do this by
setting a "negative" offset in the tracking generator configuration.
Example for reverse sweep:
F
AnalyzerStart
= 100 MHz
F
AnalyzerStop
= 200 MHz
F
Offset
= -300 MHz
Numerator = Denominator = 1
→F
GeneratorStart
= 200 MHz
→F
GeneratorStop
= 100 MHz
If the offset is adjusted so that the sweep of the generator crosses the minimum gener-
ator frequency, a message is displayed in the status bar ("Reverse Sweep via min. Ext.
Generator Frequency!").
Example for reverse sweep via minimum frequency:
F
AnalyzerStart
= 100 MHz
F
AnalyzerStop
= 200 MHz
F
Offset
= -150 MHz
F
min
= 20 MHz
Numerator = Denominator = 1
→F
GeneratorStart
= 50 MHz
→F
GeneratorStop
= 50 MHz via Fmin
Result Frequency Start
For reference only: The start frequency for the generator, calculated from the config-
ured generator frequency and the start value defined for the analyzer.
Result Frequency Stop
For reference only: The stop frequency for the generator, calculated from the config-
ured generator frequency and the stop value defined for the analyzer.
Type
Generator type. See also Chapter 8.2.1, "Overview of Generators Supported by the
R&S ESR", on page 482.
Remote command:
SYSTem:COMMunicate:RDEVice:GENerator<generator>:TYPE on page 914
Configuring Tracking Generators